Eight states are set to decide the fate of which party controls the Senate for the next two years. 

Republicans are the slight favorites to win the upper chamber, which has a one-seat Democratic majority. If Democrats hold on, Majority Leader Chuck Schumer (D-NY) will continue in his time as leader, but the leader of the Republican caucus remains a mystery as longtime leader Sen. Mitch McConnell (R-KY) announced he would not seek the post again.